15 March 1996 In-line four-wave mixing correlator
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We demonstrate the implementation of an in-line four-wave mixing correlator using a BSO photorefractive crystal as a dynamic holographic medium. The advantage of this correlator is the perfect overlap of the Fourier transforms of the reference and probe images inside the crystal due to its in-line geometry. Therefore the Bragg diffraction is the only limit to the angle between writing beams. An experimental investigation about the Bragg limitation in the shift invariance of the correlator performance is also presented.
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Sergio F. S. Santos, Sergio F. S. Santos, Armindo L. V. S. Lage, Armindo L. V. S. Lage, Augusto O. S. Gomes, Augusto O. S. Gomes, } "In-line four-wave mixing correlator", Proc. SPIE 2752, Optical Pattern Recognition VII, (15 March 1996); doi: 10.1117/12.235651; https://doi.org/10.1117/12.235651

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